Engine control



Nov. 9, 1948.. w H. A. ALEXANDEIRSON 2,453,550

ENGINE CONTROL Original Filed Nov. 4, 1941 5 Sheets-Sheet 2 fiowardlfllekanwsm Nv. 9, 1948. H. A. ALEXANDERSON 2,453,650

' ENGINE CONTROL Original Filed Nov. 4, 1941 5 Sheets-Sheet 3 H wara flfllexandensor;

Nov. 9, 1948. H. A. ALEXANDERSQN 3,

ENGINE CONTROL ori inal Filed Nov. 4, 1941 5 Sheets-Sheet 4 mmvrok BY I Nov. 9, 1948.

Original Filed Nov. 4, 1941 H. A. ALEXANDERSON ENGINE CONTROL 5 Sheets-Sheet 5 F'ILDTS EUNTREIL LEVERS SUPER-CHARGER.

EXHAUST DRIVEN TURBO -192 EXHAUST A mam; MANIFOLD Z2- F'lLU'T5 common.

'LEVER.

INTAKL MANIFOLD 7 SUPLRCHARGER.

enema-- :I'HIDTTLL- 4'22 ENGINE nmvm sum 5 INVENTOR. fiowazudfllexandensm.

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' ATfURWEY Patented Nov. 9, 1948 ,Howard A. signor to i boro. N. J.,

- "moms: common Ale'xandercon. Wood-Ridge, N. J as Bendix Aviation Corporation, Tetera corporation of Delaware a Original appiicationNovember 4, 1941, Serial Bio.

Divided and this application August 22, 1944,; Serial N0. 550,646

The present application is a division of copending application Serial No. 417,855.flled November 4, 1941, and .now U. 8. Patent No. 2,358,845, granted September '26, 1944,--and is a continuation in part as to all common subject matter of copending application Serial No. 508L724, filed November 2, 1943, and now abandoned. The application relates to internal combustion; engine controls and more particularly to novel regulator means for governing the air supplied to the comb'ustion chamber of an aircraft engine.

An object of the invention is to provide a'novel regulating device for an aircraft engine or an air craft supercharger.

'Another object of the invention is to provide a novel simplified linkage arrangement and mechanical assembly for a regulating device. Another object of the invention is to provide a regulating means including a novel selector shaft having an eccentric pin arranged to vary the setting of the regulator with a minimum move- 'ment. 1

Another object of the invention is to provide a novel simplified follow. up arrangement in eluding an adjustment shaft having an eccentric pin, arranged so as to tend to return the control means for the regulator to a neutral position.

Another object of the invention is to provide a novel means for effecting a lock out of the reg ulator upon the pressure selector being adjusted to a predetermined minimum pressure selecting position, whereupon operation of the regulated device may be effected by manual operation of the pressure selector.

Another object of the invention is to provide a novel eccentric pin fulcruming means for effecting the'support and operation of the control linkage.

A further object is to provide a novel means for controlling the intake pressure of an aircraft engine. v

These and other'obiects of the invention will become apparent from inspection of the following specification when read with reference to the accompanying drawings wherein is illustrated the preferred embodiment of the invention. It

25 Claims. (Cl. 123-103} J Figure 1 is a viewin elevation of one form of my invention; Figures 2, 3 and 4 are sectional views .of the valve assembly along' the lines 2-2, 3-3, and L4, respectively, of Figure 5;

. Figure 5 is a longitudinal sectional view along the line 5-5 of Figure '7; V

Figure 6 is a transverse sectional view alon the line 6+8 of Figure 5;

Figure 7 is a view partly in elevation and partly in section along the line 1-1 of Figure 5;

Figured is a transverse viewalong the line 8-4! of Figure 5;

spectively; the

Figure 9 is a diagram of the fluid connections between the valve assembly and the servo unit;

Figure 10 is a view illustrating schematically the operating linkage arrangement ofthe form of the invention shown in Figure 1; a

Figure 11 is a schematic view illustrating the form of the invention shown in Figure 1 applied as a regulator for the waste gate of an aircraft engine supercharger.

Figure 12 is a schematic view illustrating the form of the invention shown in Figure 1 applied as an aircraft engine throttle control.

Referring first to Figures 1 and'lO, reference characters ii and i2 designate levers having an operative connection with shafts i3 and it relever i i being adapted for manual operation by means of a pilot's control lever in a manner such as shown in Figures Hand 12, and the lever I! may be operatively connected by a link IZA to waste gate MB of a supercharge as shown in Figure 11, or to an intake throttle I26, of an aircraft engine as shown in Figure 12.

The shaft it (and. therefore the lever if!) is adapted to be swung in both directions to produce a corresponding shifting of the element conis to be expressly understood however, that the drawings are for the purpose of illustration only,

. and are not designed'as a definition of the limits trolled thereby in response to automatic shifting of a servo element IS. The servo element It has provided a hub portion ll (Figures 5 and 8) intemally splined or serrated to engage corresponding splines or serrations 18 on the-central portion of the shaft i4. 1 The servo element 16 is shown in Figure 8 as in the form of a rockable piston or vane, movable between two radial abutments 2i and 22 in response to the admission-and exhaust of fluid pressure to and from the sector shaped chambers 23' and 24 which are formed by the abutments 2| and 22 on the one hand, and the vane It on the other; the outer portion 2'! of the vane being adapted to fit snugly upon the inner cylindrical surface of the housing memher 28 forffluid tight engagement therewith.

The means for controlling the alternate supply to, and exhaust from, the chambers 23 and 24 is shown as including a valve assembly consisting of a central movable plunger portion 3| (see Figures 5 and an inner valve sleeve 32 and an outer valve'sleeve 33; the inner sleeve32 being rotatable in respect to the otherfor proper indexing of the ports therein, after which the unit is fixed in the adjusted position by pin 34, cap 38" and a final securing element 3l.-

The valve assembly is housed in a central portion 33 which extends upwardly from the main housing 39 of the device, and is located directly above the operating linkage connecting the manually operable shaft l3 with the valve 3|. As probably best shown in Figure 10, the latter connectlng'means includes a pin portion |3A provided at the inner end of the shaft l3 and positioned in eccentric relation to the axis of rotation of the shaft l3, indicated .by line u-y.

Fulcrumed on the eccentric pin portion |3A is a lever 40 which is operably connected at one end by linkage members 4| to one end of a second lever 44. The lever 44 is connected at the opposite end by linkage members 43 to the valve "plunger 3|.

The lever 40 is further connected through linkage members 46 to an arm 41 fixedly connected to a rockshaft 49 journaled in a bearing 5|, carried by the housing 33. The rockshaft 49 is adapted to receive at the opposite end an apertured end portion 52 of a lever 53 which is suitably fastened thereto. The lever 53 is operatively connected through a reciprocable element 56 to a pressure responsive membrane or diaphragm element 51, as will be explained hereinafter.

The lever 44 and arm 41 have projectingend portions 44A and '41A respectively. Between the projecting end portions 44A and 41A there is connected a spring 48 to assure a more accurate mechanical fit between the various linkage elements and'to take up frictional wear which may result through continued operation of the device. The lever 44 previously noted is fulcrumed on a pin |4A provided at the end of a shaft I413. The shaft MB is connected by a key NC to the shaft I4. The pin portion |4A is positioned in eccentric relation to the axis of rotation of the shaft l4 and- MB, indicated by line :r-x.

The link 44 is so pivotally mounted .on the inner pin portion |4A that the link 44 will swing in response to rotation of shaft l4-|4B; but the pin and link 44 arenot rigidly fastened, one to the other, as the link 44 can also be swung by movement of the link 4|, even though the shaft l4-I4B and inner pin portion Hit of the shaft 143 are held stationary by the balanced pressures acting upon opposite sides of vane Hi.

The same is'true of the connection between 1 the inner pin portion |3A of the shaft l3 and the arm 40. Thus, movement may be imparted to the arm 40 connecting links 4| and 43 by movement of the eccentric pin portion I3A and also by independent movement of links 4| and 45 effected through operation of the pressure responsive element 51.

The lever 53, as previously described, has an operative pivotal connection with the outer end of a recip'rocable element 56. constituting part of the pressure responsive diaphragm assembly Corporation. The diaphragm assembly also in-' I and serves to clamp the flexible diaphragm 51 to the member 53 at the central portion of the diaphragm. Attaching to the plate 58 at its periphery is a flexible corrugated sheet 63 whose opposite end attaches to the periphery of a plate 64 which is secured to the end surface 56 of the housing 33 as indicated at 51 and 88. The member 63 thus constitutes a bellows adapted to be pre-evacuated, and a coiled compression spring H is mounted in the bellows tourge the plate 53 (and hence the diaphragm 51) in a rightward direction as viewed in Figure '7, thereby opposing theecollapsing tendency of the evacuated bellows, and holding the latter in equilibrium. A screw 12 is provided for limiting movement of member 56 in response to expansion of the bellows 63 under the biasing force of the spring 1|.

The screw 12 projects. through the housing wall 39 and may be adjusted from the exterior thereof upon removal of a cap 12A.

It will be seen that by appropriate adjustment of thescrew 12 the movement of the reciprocable element 53 may be limited as desired and accord-v ingly the adjustment of the shaft 43. Upon such limitation to the adjustment of the shaft 43, the valve 3| may be controlled by manual operation of the lever II and shaft l3 independently of the bellows'5l and without interference from said limiting means.

Fluid under pressure is supplied by means of an oil pump (not shown) operated by suitable driving means and from the said pump the oil under pressure is adapted to be supplied to the chambers 23 and 24 of the servo unit under the control of the movable plunger. of the valve assembly, which plunger is in turn under the control of the linkages 41, 48, 40, 4|, 44, and". The said linkages are i n a central chamber 15 provided in the housing 33. The" linkage 46 is operably connected to one end oi. a rockshaft 49, which is in turn connected at the opposite end to the lever 53 movably mounted in a chamber 13. The lever 53 is connected to the reciprocable member 58 and is urged in one direction by the pressure of the spring upon the elements 58 and 51, and n the opposite direction by the pressure of ail (1 medium supplied to the chamber 13 by way of a conduit shown at 3| in Figure 5, which conduit maybe connected at its opposite end to the carburetor inlet manifold space between the elements 63 and 58, on the one hand, and the inner surface of the'slack diaphragm 51 on the otheri This oil constitutes whose flexible membrane or diaphrgam element is'shown at 51. The diaphragm assembly is cov-' ered in U. S. Patent No. 2,358,845, granted eptember 25, 1944, and assigned to Bendix Aviation a damping agency as well as constituting the means for transmitting to' the bellows 53 the pressure being supplied to the diaphrgam 51 by the fluid medium enteringthe chamber" by way of conduit 8|. In other words,.the pressure which opposes the spring H (and therefore, in conjunction with said spring constitutes the operating means for the valve shifting linkage 56, 53, 49, 41, 46, 40, 4|, 44, 43) is transmitted by the slack diaphragm 51 directly to the oil in space 95, and from said oil the pressure istransmitted to the bellows 63.

7 Hence the slack diaphragm 51 is not loaded in any way whatever,

and serves merely to retain the oil in the space 9!. Thus there is provided means for damping the vibrating tendency (which is characteristic of a bellows of the type indicated at 63) which means at the same time serves to segregate the damping liquid from the supply of'fluid medium which is introduced to the chamber by way of the conduit 8|.

Figures 9 and 10 show diagrammatically the manner in which the shifting of the plunger SI of the valve assembly operates to supply fluid to one side or the other of the servo-motor ||i-of Figure 8, while at the same time permitting an exhaust of operating fluid from the opposite side thereof the conduits connecting the valve chamher with the two chambers 23, 24 of the servo unit being indicated at 91 and 98, and the supply conduit at 99, while the two exhaust ("drain") passages are indicated at IN and |ii2,-theformer being the exhaust passage when chamber. 24 is being evacuated by way of conduit 88, and the passage Hi2 being the exhaust passage when the chamber 23 is being evacuated by way of conduit 9i.

The word "indexing" as used herein means the turning of one ofthe valve sleeves 82. or 38 with resptct to the other, to bring about the "desired radial alignment of the ports of one with thosejof the other.

It will be seen that by turning the valve sleeve 7 82 ninety degrees in a counter-clockwise direction as viewed in Figure 2, two of the outlet ports will open into the drain |0|; upon turning the same onefhundredand eighty degrees four of the ports will open into the drain |0| and upon turning the sleeve 32 two hundred and seventy degrees three of the ports will open into the drain II. The ports of the sleeve 32 opening into the drain I02 are similarly arranged.

Once this iindexing" has been accomplished,

there is no further relative rotation between these That is, the alternateopening valve sleeves. and closing of the several ports is accomplished,

during operation of the device, by the rectilinear motion of the valve plunger 3|, and not by any relative movement of elements Bland 33. The

turning will move the linkage", 46, 40, 4H, 44

and 43 and-hence the valve plunger 3| will be shifted to a lower position. This shift of the valve plunger 8| will establish two parallel paths of flow: one path being from servo-motor chamber .24 to the outlet |0| (Figures 9 and 10) and the Y other path being from pressure source 98 to the servo-motor chamber 23. The pressure thus exerted on vane it of the servo motor will cause rotation of shaft H in a counter-clockwise direction, as viewed in Figure 10, so as to effect through arm I2 9. corresponding change in the throttle or waste gate setting, as shown in Figures 11 and 12,

to effect a decrease in the manifold pressurein order to restore the intake manifold pressure to relative movement of the sleeve 82, as described,

serves to calibrate the outlet to the drains IBI and I02, so that the servo mechanism may be readily adjusted'for the particular work involved.

The improved regulator is arranged to control the induction system of an aircraft engine. Such induction systems are of course well known in the art as well as regulators for the same as shown for example in the U.S. Patent No. 2,024,202, granted December 17, 1935, to Adolph Berger. For purposes of illustration, however; typical systems are shown diagrammatically in Figures 11 and 12.

In the operation of my regulator in a system such as shown in Figures 11 and 12, the valve plunger will remain in the neutral position so long as the waste gate setting of Figure 11 or the carburetor throttle setting of Figure 12 is correct for maintenance of the desired pressure in the carburetor intake manifold as in the intake manifold of the engine respectively. at the engine loading and altitude concurrently prevailing. When engine loading or altitude changes, however, the said manifold pressure will change correspondingly. If the manifold pressure increases the pressure in chamber 16. will increase correspondingly, as the chamber i8, is connected to the .said manifold by the conduit II. This pressure increase vwill cause displacement of the slack diaphragm 51, and the pressure thus exerted the predetermined value. of Flgure-11 will be progressively opened, while the throttle of Figure 12 will be progressively closed. Upon such rotation of shaft l4 a corresponding movement will beimparted to shaft B and eccentric pin I4A, causing the shaft I43 and pin |4A to move in a counter-clockwise direc; tion as viewed in Figure 10 due to the eccentricity of the pin portion 4A ofthe shaft MB in relation to the axis of rotation of the shaft i413.

. Such movement of the'pin'Ha will cause the link 44 to swing on its pivotal connection to the link 4| in acounter-clockwise direction so as to tend to raise valve plunger 3| to the neutral position, which together with an expansion of the diaphragm 5! to the left due to decrease in 1 the manifold pressure will efiect a return of the valve 3| to a neutral position. The action of the pin |4A thus tends to anticipate the change in pressure effected by the" adjustment of "the arm I 2 and provides a follow-up" arrangement which gives stability to the control device. When manifold pressure drops below the predetermined point, the bellows 63 will expand to shift member 56 to the left as viewed in Figure 10, and the linkage will then cause valve plunger 3| to move to a higher position. Again two parallel paths pf flow will be established, but this time they will operate to swing vane IS in the opposite or clockwise direction, as viewed in Figure 10 thus shifting the arm I2 oppositely to.the direction heretofore referred to so as to increase the intake manifold pressure. The follow-up" action of the pin |4A moving in a clockwise direction will actuate link 44 so as to tend to again restore the valve 3| to a neutral position when manifold pressure has been restored to normal.

Likewise upon manual adjustment of the lever ii there will be imparted a movement to the eccentric inner pin portion |3A of the shaft i3, which as previously explained will cause the link 40 horizontally connecting the links 46 and 4| to swing in such a mannenas to pivot on its connection to the link 46 so astp move the linkages 4|, 44, 43 and hence the valve plunger 3| in a direction to" effect an adjustment of the throttle or waste gate setting. The latter movement will also effect an adjustment of the value of the manifold pressure setting at which the bellows 51 will adjust the valve plunger 3| to a neutral position.

Thus it will be seen that byadjusting the lever H in a counter-clockwise direction as viewed in Thus the waste gate accaeso Figure 10, the pin ISA will move about the axis y-y and thus the fulcrum point of the lever in eccentric relation to said shaft and operably connecting said shaft and said floatinglever, said 1 member directly supporting said floating lever in pivotal relation to said shaft.

direction for increasing the pressure in the said manifold by appropriate adjustment for example of the waste gate |2B of Figure 11 for increasing the driving speed of the supercharger or as shown in Figure 12 by further opening the throttle. t

It will be further seen that by changing the fulcrum' point of the lever 40 by the aforenoted adjustment of the pin ISA, the determined pressure setting to be maintained by the diaphragm" 51 is increased.

Likewise the determined pressure setting to be maintained by the diaphragm 51 may be decreased by moving the lever II, as viewed in Figure 10, so as to adjust the eccentric pin A in a clockwise direction about the axis of rota-. tion 11-11 and thus the fulcrum point of the lever 40.

The follow up action of the pin A, previously,

described, will of course upon rotation of the shaft MB in response to adjustment er the shaft l3 and eccentric pin |3A tend to restore the valve plunger 3| to a neutral position.

It will be further seen that through appropriate adjustment of the screw 12 the operation of the regulator may be conveniently transferred from automatic to manual control upon operation of the lever so as to select a pressure below that at which the element 56 is limited by the screw 12. There is thus provided novel means for effecting manual control of the motor i6 within limits dependent upon the adjustment of the screw 12. The control of the valves |2B or I IC- may be thus shifted from automatic to manual control at the'will of the pilot or operator.

It will be readily seen that upon adjustment of the lever l| within the manual range, the

valve 3| will be adjusted to one side of the neutral position causing movement to be imparted to the motor l6 and adjlmtment of the eccentric pin |4A so as to return the valve 3| to its neutral position. \Thus the regulator may be man- I ually controlled at the will of the operator within a range determined by .the adjustment of the screw 12.

Although the present invention is only described and illustrated in detail for one embodiment thereof, it is .to be expressly understood that the same is not limited thereto. Various changes may be made in design and arrangement of the parts illustrated, as will now be apparent to those skilled in the art. For a deflnitionof the limits of the invention, reference should be had to the appended claims.

What is claimed is:

1. A control mechanism comprising in combination a floating lever, control means connected to the lever, motor means including a vane, a shaft pivotally supporting said vane, said vane being controlled by the control means, actuating means operatively connected to said lever to affect said control means, and a follow up mechanism between the shaft and the floating lever, including a member mounted at one end of and 2. A control mechanism comprising in combination a floating lever, control means connected to'the lever, motor means including a shaft, a vane extending radially, from said shaft and pivotally supported thereby, said vane being con-' trolled by the control means, and a follow up mechanism between the shaft and the floating E lever, including an eccentric pin provided at one endof said shaft and pivotally supporting said floating lever, and a control member ailixed at the opposite end of said shaft and adjustably positioned by said motor means.

1 3. A control mechanism, comprising, in combination, a floating lever, a-valve connected to one end of said floating l'ever,-control means connected at the other end of said floating lever, I

hydraulic motor means including a shaft, a vane projecting radially from said shaft and pivotally supported thereby, said vane being operably con trolled by the valve, a follow up mechanism between the shaft and the floating lever, including an eccentric pin provided at one end of said shaft and pivotally supporting said floating lever at a point intermediate the opposite ends of said floating lever, and a control member ailixed to said shaft and adjustably positioned by the motor means.

' 4. A control mechanism; comprising, in combination, a floating lever, a valve connected to one end of said floating lever, a membrane responsive to changes in an operating condition, said membrane operably connected to the other end of said lever, hydraulic motor means including a shaft, a vane projecting radially from-said shaft and pivotally supported thereby, said vane being operably controlled by the valve, a follow up mechanism between the shaft and the floating lever,- including an eccentric pin provided atone'end of said shaft and pivotally supporting said floating lever at a point intermediate the opposite ends of said floating lever, and a control member aflixed to said shaft and adjustably positioned by the motor means. i

5. A control mechanism, comprising, in combination, a first floating lever, a valve connected to point intermediate the opposite ends thereof, a

membrane responsive to changes in an operating condition, said membrane operably connected to the other end of said second floating lever, hydraulic motor means being operated by the valve, said motor means including a vane, a shaft pivotally supporting said vane, and a follow up mechanism between the shaft and the first floating lever, including an eccentric pin provided at one end of said shaft and pivotally supporting said first floating lever at a point intermediate the opposite ends of said flrst floating lever.

6. 'A control mechanism, comprising, in combination, a first floating lever, a valve connected to one end of said first floating lever, a second floating lever having one end operably connected to the other end of'the first floating lever, a rotary control member, an eccentric pin provided at one end of said rotary member and pivot ally supporting said second floating lever at a point intermediate the opposite ends thereof, a membrane responsive to changes in an operating n I r 2,458,060

condition, said membrane operably connected to the other end of said second floating lever, hydraulic motor means being operated by the valve, said motor means including a vane and a shaft rotatably supporting the vane, and a follow up mechanism between the shaft and the first floating lever, including an eccentric pin provided at one end of said shaft and pivotally supporting said first floating lever at a point intermediate the opposite ends of said first floating lever.

7. A control mechanism, comprising, in com blnation, a floating lever, control means connected to one end of the floating lever, a membrane responsive to changes in an operating condition, said membrane operably connected to the other end of said lever, motor means being operated by the control means. a shaft driven by said motor means, a follow up mechanism between the shaft and the floating lever, including an eccentric pin provided at one end of said shaft and pivotally supporting said floating lever at a point intermediate the opposite ends of said floating lever adjustable lockout means limiting the operation of said lever by said membrane, and manually operable means connected to the lever for actuating said control means independently of said membrane,

8. A control mechanism, comprising, in comblnation, a floating lever, control means connected to one end of the floating lever, a membrane really supporting said floating lever at a point intermediate the opposite ends of said floating lever.

9. A control mechanism, comprising, in comsaid first floating lever and pivotally supporting centric means operabiy connecting said shaft to said first floating lever, a secondlfioating lever operably connecting said first floating lever to said motor control means; a follow up mechanism between the motor means and the second floating lever, including a second eccentric means driven by said motor and operably connecting said motor means to said second floating lever and-pivotally supporting said second floating lever; a boost control connected to said first floating lever and arranged to operate said motor control means through said first and second floatinglevers in such a manner as to maintain the pressure in the induction system of said engine at a selected value. and said first eccentric means arranged to change the said selected value upon adjustment 7 of said shaft.

12. A control mechanism for an aircraft engine, comprising, in combination, a first shaft adopted to be connected at one end to a pilots l control lever, motor means, a second shaft driven by said motor means and adopted to be connected to means for regulating the pressure in the induction system of said engine, control means for said motor means, means for connecting said first shaft so as to control the operation of said motor control means, said connecting means including a first floating lever, a first eccentric pin provided at the other end of said first shaft-for operabiy connecting said first shaft to said first floating lever at a point intermediate the opposite ends of said first floating lever, a second floating lever conbination, a floating lever, control means operabiy connected to one end of said floating lever, a membrane responsive to changes in an operating condition, means operabiy connecting said membrane to the other end of said floating lever, means for locking said membrane out of operative relation, and means pivotally supporting said floating lever at a point intermediate the opposite ends thereof for operating said control means independently of said membrane. i

10. A control mechanism, comprising, in combination, a floating lever, control means operably connected to one end of said floating lever, a membrane responsive to changes in an operating condition, means operabiy connecting said membrane to the other end of said floating lever, means for locking said membrane out of operative relation,

and eccentric pin means pivotally supporting said nected at one end to said motor control means and operably connected at the other end to one end of said first floating lever; a follow up mechanism between the motor means and the second floating lever, including a second eccentric pin provided at one end of said second shaft and operably connecting said second shaft to said second'floating lever at a point intermediate the opposite ends of said second floating lever; a boost control connected-at the other end of the first floating lever and arranged to operate said motor control means through said first and second floating levers in such a manner as to maintain the pressure in the induction system at a preselected pressure value, and said first eccentric pin arranged to change the said selected pressure value adjustment of said first shaft.

1 3. A control mechanism for an aircraft engine,

comprising, in combination, a rotary motor means for regulating an operating condition of said engine, a control means for said motor means, a membrane responsive to changes in said operating condition, means operably connecting said membrane to said motor control means, a rotatable shaft, a pin projecting from one end of the shaft in eccentric relation thereto, said pin operably connected in said connectingmeans between said membrane and said control means for effecting said control means independently of said membrane, a second pin eccentrically mounted relative to said rotary motor means and operably connected to said motor means and in said connecting means between said membrane and said control means for effecting a follow up action on said control means upon rotation of said motor means.

14. The combination with an internal combustion engine having an intake conduit and a valve for controlling the flow of combustible mixture to said intake conduit, power means adjusting the,

position of said valve, automatic means responsive to engineintake pressure for effecting the position of said valve through said power means,

aesaeso ll I manually operable means for effecting the position of said valve through said'power means, stop means to lock out of operation said automatic means, said stop means adjustably arranged adjusting said limiting means so as to vary predetermined range.

- l9. A device oi. the character described, comprising, in combination, engine operating condithe to eiTect a transfer of the control of said power, tion responsive means for adjusting a control demeans from'automatic to manual control, said stop means being arranged in such a manner that said manually operable means may independently control the position of said valve vice so as to maintain a predetermined condition, manually operablemeans for varying the datum of said co dition responsive means, means for limiting t e adjustment of said control device through aid p w 'm Wi interference l by said condition responsive means, and said last from said automatic means, and means responsive to movement of said manually operable means for adjusting the setting of said automatic means.

15. The combination with an aircratt engine and a valve for controlling an operative condition of the engine, of a power means for adjusting the position of said valve, automatic means responsive to changes in atmospheric pressure and an operamentioned meansbeing arranged in such a manner that said manually operable means may control the position of said device without interierence from said limiting means.

20. In a control for an internal combustion engine throttle, a servo motor including a power member and a control member, means connectingthe power member to the throttle, induction tive condition of the engine for controlling the pressure responsjve means for varying t p051- position of said valve through said power means. ti of thecontrol m b means for changing manually operable means for controlling the. position of said valve through said power means, means arranged to effect a transfer of the control of said valve from automatic to manual control at will, said last mentioned means being arranged in such a manner that said manually operable 16. ,A device of the character described, comprising, in combination, motor means for adjusting a control device, an engine operating condition responsive means for controlling said motor means so as to maintain a predetermined operative condition of the engine, a manual yoperable control member for adjusting the setting of said condition responsive means, and means for limiting the range of control of said motor means by said condition responsive means, said last mentioned means being arranged'in such a manner that said controlmember may solely control within a predetermined operating range the position of said motor means without interference from I, said limiting means.

the setting of said pressure responsive means, means operative when the pressure setting of .said pressure responsive means is below a predetermined value for limiting the operation by ,said-pressure responsive means, of said control and said setting changing means arranged so asto control the position of said control member during the latter limited operation without interference from said limiting means.

21. In a control for an internal combustion engine, means for controlling an operative condition of the engine, a servo motor including a power member and a control member, means connecting the power member to the engine control means, engine operating condition responsive means for varying the position or the control member, manually operable means for changing the datum of said condition responsive means,

means for limiting the operation by said condi- 40 tion responsive means of said control member 17. A device of the character described, comprising, in combination, engine operating condipositioning a control device, a control member for changing the datum of said automatic means, and means for limiting the control of said power means by said condition responsive means, said limiting means'being arranged in such a manner that said control member may control the position of said control device through said power means without interference from said limiting means and within a predetermined range of operation of said control member,

18. A device 01 the character described, comprising, in combination, engine operating condition responsive means, power means controlled by said condition responsive means for automatically adjusting a control device, a control member for changing the datum of said automatic means, and means for limiting the control of said power means by said condition responsive means. said limitingmeansbeing arranged in such a manner that said control member may control position'of said control device through said power when the datum 0! said condition responsive trol member within said predetermined range and without interference from said limiting means.

22. In a control for an internal combustEn engine throttle, a servo motor including a power member and a control member, means connectsaid element may vary the position of said control member upon change in such pressure, manually operable means connected to the last mentioned connecting means and arranged so as to vary the relationship of said control member and element,'an adjustable member arranged so as to limit the movement of said element, and said manually operable means arranged so as to solely control said control member through said connecting means upon such limitation to the movement oi said element so as to provide man- -ual control of the position of said throttle through the power member.

23. The combination with an internal combustion engine having an intake conduit and a 7. throttle valve for controllingiiow of combustible mixtureto said intake conduit, of manually operable means for controlling the position oi said meansjand within a predetermined range of opvalve, automatic means responsive to engine in eration of said control member without interference from said limiting means, and means for valve, means for transferring alternatively from take pressure for controlling the position of said manual to automatic control throughout the range of operation of said throttle valve, and means responsive to movement of said manually operable means for adjusting the setting of said automatic means.

24. 'A device of the character described, comprising, in combination, condition responsive means for automatically adjusting an engine operating control device, a control member for adjusting said automatic means, and means for 10 limiting the adjustment of said control device by said automatic means upon a predetermined adjustment of said control member, said last mentioned means being arranged in such a manner that said member may independently adjust 15 said control device without interference from said limiting means.

25. For use with a supercharged engine having an intake conduit and an exhaust conduit, and

a valve for regulating fluid pressure in one of 20 said conduits; a control mechanism comprising, in combination, means for adjusting the position of said valve, automatic means responsive to the fluid pressure in one of said conduits and to control the position of said valve through said 25 'first mentioned means, a single manually operable member to control the position of said valve through said first mentioned means, means arranged to effect a transfer of the control of said valve from automatic to manual control, said last 3 mentioned means being arranged in such a manner that said manually operable member may in? dependently control the position of said valve through said first mentioned means without interference from said automatic means, and

means responsive to movement oi. said manually operable member for adjusting the setting of the automatic means.

- HOWARD A. ALEXANDERSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Germany Mar. 16, 1933 Patent No. 2,453,650.

Certificate of Correction November 9, 1948.

HOWARD A. ALEXANDERSON It is hereby certified that errors appear in the printed specification of the above numbered patent requiring correction as follows:

Column 7, lines 71, 72, and 73, strike out the words and comma actuating means operatively connected to said lever to affect said control means, and insert the same in column 8, line 10, after the Word and comma means,; column 9, lines 68 and 70,

i and column 10, lines 21 and 23, for adopted read adapted; column 11, line 72, before position insert the; lines 73 and 7 4, strike out and Within a predetermined range of 1 operation of said control member and insert the same after the Word and comma means,, same column, line 75; column 12, line 25, after means strike out the comma; same line, after control insert member,; column 13, lines 8 and 9, strike 1 out an engine operating and insert the same before condition in line 7, same column; line 9, before control first occurrence, insert a;

and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 22nd day of March, A. D. 1949.

THOMAS F. MURPHY,

Assistant Commissioner of Patents. 

